Chip deflecting device for skiving machines



1942. A. w. JESTER 2,305,618

CHIP DEFLECTING DEVICE FOR SKIVING MACHINES Filed July 24, 1941 Figfl.

cated close to the edge of the knife.

Patented Dec. 22, 1942 UNITED STATES PATENT OFFICE CHIP DEFLECTING DEVICE FOR SKIVING MACHINES Arthur W. Jester, Malden, Mass., assignor to United Shoe Machinery Corporation, Flemington, N. J a corporation of New Jersey Application July 24, 1941, Serial No. 403,853

8 Claims.

This invention relates to chip deflecting devices and is herein illustrated as embodied in a device particularly suited for use with skiving machines of the Amazeen type.

In machines of this general type the work is fed by a feed roll beneath a presser to a rotary disc knife, the knife on the one hand and the roll and presser on the other being relatively adjustable toward and from each other in the lineof feed movement of the work to provide for wear of the knives due to their being ground. The knife when new has a. given diameter, but this diameter decreases as the knife is used. The work passes beneath the knife while the waste skivings or chips pass over it. These chips, instead of passing freely to the rear with the work, sometimes exhibit a tendency to wind about the rotating knife shaft and sometimes a tendency to curl back overthe presser so that their free ends are carried beneath the presser and fed forward with the work.

According to the present invention there is provided an adjustable chip deflector to prevent the curling back of chips and a second deflector to direct the chips to one side. If a given chip exhibits no tendency to curl back over the presser, it is simply deflected to one side by the second deflector. If it does curl back, it is deflected by the first deflector to the second deflector and thus to one side. The deflector which prevents curling back of the chips should always be 10- In order to be able to maintain the desired position of the deflector with respect to the edge of the knife when relative adjustment of the knife and feed roll takes place to compensate for adecrease in the diameter of the knife, said deflector is yieldingly held against a member which is associated with the feed roll.

These and other features of the invention including certain details of construction and com.- binations of parts will be described as embodied in an illustrated device and pointed out in the appended claims. With reference to the accompanying drawing,

Fig. l is an end elevation of a portion of a skiving machine fitted with the chip deflecting device of the invention, a piece of work being shown in process of having its margin skived;

Fig. 2 is a front elevation of the same parts, the skiving of the margin having proceeded somewhat farther than is shown in Fig. 1;

Fig. 3 is a view looking down upon the knife and the chip deflecting device, the knife shaft and the stationary sleeve, in which it is rotatably mounted, being shown in cross section; and

Fig. 4 is a prospective of the chip deflecting device.

The general organization of the machine shown is similar to that of the machine shown in United States Letters Patent No. 1,866,918, granted July 12, 1932, upon an application filed in the name of Milton H. Ballard; and, before proceeding to a description of the chip deflecting device, so much of the construction of the machine as is necessary to an understanding of said device will be given. The machinecomprises a rotary feed roll l and a rotary feed disc 9 which cooperate to feed the Work away from the observer, as viewed in Fig. 2, to a rotary disc knife ll, the edge of the work contacting with an edge guide l3, and the margin of the work being pressed down upon the feed roll by a yielding presser I5. In the operation of the machine the work IE0 is fed away from the observer, as viewed inFig. 2, to the left as viewed in Fig. l, and is skived on'a bevel along its margin, the chip 200 passing over the knife while the body portion of the work passes beneath the knife. As the knife becomes worn, due to its being ground, its diameter decreases; and, in order to provide for maintaining the roll and knife in proper relative positions, the bracket ll, which carries the roll shaft 19, the presser l5 and the edge guide I3, is mounted for a substantially horizontal adjustment toward and from the knife so that these work-engaging members may be adjusted into proper positions as the knife becomes smaller. The presser i5 is fast to the lower end of an upright stem 2! which is vertically slidable in a hollow member 23. A spring, not shown, continually urges the presser downward as far as a stop nut 25 will permit. The member 23, as well as the member which carries the edge guide 13, is mounted upon the bracket 11 so that, as has been stated above, these workengaging members are adjusted with the roll toward and from the knife. The knife shaft 20 is rotatably mounted in a stationary sleeve 27. The machine as thus briefly described is old and well-known and no further description of it will be given, reference being made to the patent for details of construction not herein set forth.

The chip deflecting device (Fig. 4) comprises a base 3| having a substantially flat top and a downwardly extending wall 33 which serves as a deflector for directing the chips to one side, the right-hand side as viewed in Fig. 3, in which the direction of rotation of the knife is indicated by the arrow. Formed in the rear portion of the base 3| is a half round opening, and pivoted to the base at 35 is a clamping member 31 the inner face of which is also half round. At that end of the member 37 which is remote from the pivot 35 is a projection having a threaded hole to receive the end of a clamping screw 39 so that the base 3i may be clamped in adjusted angular position about the stationary bearing sleeve 21. If the chips exhibit no tendency to curl back over the presser, they pass directly to the deflector 33 and are deflected to one side.

In order to prevent chips from curling back over the presser, that is in a direction opposite to the direction of feed movement of the work, a second deflector 4! is provided in the form of an upright wall located in front of the knife, said deflector being a downwardly extending flange on a member 43 which is flat and rests upon the flat top of the base 3!. The right-hand edge (Fig. 4) of the member 43 is slidably mounted in a guideway formed in a portion of the base 3!. At its left-hand end the member 43 has a downwardly extending flange G5 (Fig. 1) provided with a horizontal slot 41 through which extends the stem of a screw 49, said screw being threaded into a downwardly extending wall of the base 3|. The member 43, which carries the chip deflector 4|, is thus slidably mounted for adjustment toward and from the knife. A spring 5| has one end resting against a projection on the base 3 passes around a stud 53 carried by said base and engages with its other end a stud 55 carried by the member 43. The spring thus tends at all times to urge the chip deflector M to move away from the knife. The adjusted position of this chip deflector depends upon the position of the bearing 23 for the stem or the presser l5, since the two parts, the chip deflector M and the bearing 3 are held at all times in contact by the spring 1 5|. Consequently, when the roll and presser are adjusted toward the knife to compensate for the wear of the knife as its diameter becomes smaller, the chip deflector 4! is adjusted with them,

its position relatively to the roll and the presser remaining always the same.

Although the invention has been set orth as embodied in a particular chip deflecting device suitable for use with a particular type of skiving machine, it should be understood that the invention is not limited in the scope of its application to the particular device nor to use with the particular machine which has been shown and described.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. For a skiving machine having a knife and a roll for feeding the Work to the knife, said knife and roll being relatively adjustable toward and from each other, a chip deflector located in position to prevent chips from curling back in a direction opposite to that in which the work is being fed, and yielding means actin at all times to urge the chip deflector away from the edge of the knife into contact with a member associated with the feed roll.

2. For a skiving machine having a rotary knife, a bearing in which the shaft of the knife is r0- tatably mounted and a feed roll, said feed roll and bearing being relatively adjustable toward and from each other, a base adapted to be fastened to the bearing, a chip deflector slidingly mounted on the base, and yielding means actin to urge the deflector away from the knife into contact with a member associated with the feed roll.

3. For a skiving machine having a knife and a feed roll, said roll being adjustable toward and from the knife, a chip deflector adapted to prevent chips from curlin backward considered in i the direction of feed movement of the work, said chip deflector being mounted for adjustment toward and from the knife, and yielding means acting at all times to urge the chip deflector away from the knife into contact with a member associated with the feed roll.

4. For a skiving machine having a knife, a feed roll and a presser, said roll and presser being adjustable toward and from the knife to compensate for wear of the knife, 2. chip deflector located in position to prevent chips from curling back over the presser and mounted for sliding movement toward and from the knife, and yielding means tending at all times to urge the deflector away from the knife, said deflector bein adjustable toward the knife against the force of the yieldin means, when the roll and presser are adjusted toward the knife.

5. For a skiving machine having a rotary knife, a bearing in which the knife-shaft is rotatably mounted and a feed roll, said feed roll and bearing being relatively adjustable toward and from each other to compensate for wear of the knife, 2. base adapted to be fastened to the bearing, a chip deflector slidable on the base, and a spring tending at all times to move the chip deflector away from said bearing.

6. For a skiving machine having a rotary knife, a feed roll and a presser, a chip deflecting device comprising a deflector in the form of an upright wall located in front of the knife to prevent chips from curling back over the presser, a base upon which said deflector is slidably mounted, a second deflector rigid with the base and adapted to prevent chips from winding about the knife shaft, and means for fastening the base to a stationary part of the machine.

'7. For a machine having a rotary disk knife, a bearing in which the knife shaft is rotatably mounted, a feed roll and a presser, a chip deflecting device comprising a base adapted to be clamped to the bearing of the knife shaft, said base having a deflector in the form of a downwardly extending wall adapted to deflect chips to one side and thus prevent them from winding about the knife shaft, a second deflector adapted to prevent chips from curling back over the presser, said second deflector being slidably mounted upon said base, and yielding means tending to move said second-named deflector away from said first-named deflector.

8. A skiving machine having in combination a rotary disk knife, a feed roll and presser, said roll and presser being adjustable toward and from the knife, an adjustable chip deflector adapted to prevent chips from curling back over the presser, yielding means tending to urge the presser toward the knife, and a member associated with the feed roll and presser and adjust able with them to adjust the chip deflector t0- wardthe knife against the force of the yielding means.

ARTHUR W. JESTER. 

